crypto/asn1/asn_pack.c

   1 /* asn_pack.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project 1999.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 #include "asn1.h"
  62
  63 /* ASN1 packing and unpacking functions */
  64
  65 /* Turn an ASN1 encoded SEQUENCE OF into a STACK of structures */
  66
  67 STACK *ASN1_seq_unpack(buf, len, d2i, free_func)
  68 unsigned char *buf;
  69 int len;
  70 char *(*d2i)();
  71 void (*free_func)();
  72 {
  73     STACK *sk;
  74     unsigned char *pbuf;
  75     pbuf =  buf;
  76     if (!(sk = d2i_ASN1_SET(NULL, &pbuf, len, d2i, free_func,
  77                                         V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL)))
  78                  ASN1err(ASN1_F_ASN1_SEQ_UNPACK,ASN1_R_DECODE_ERROR);
  79     return sk;
  80 }
  81
  82 /* Turn a STACK structures into an ASN1 encoded SEQUENCE OF structure in a
  83  * Malloc'ed buffer
  84  */
  85
  86 unsigned char *ASN1_seq_pack(safes, i2d, buf, len)
  87 STACK *safes;
  88 int (*i2d)();
  89 unsigned char **buf;
  90 int *len;
  91 {
  92         int safelen;
  93         unsigned char *safe, *p;
  94         if (!(safelen = i2d_ASN1_SET(safes, NULL, i2d, V_ASN1_SEQUENCE,
  95                                               V_ASN1_UNIVERSAL, IS_SEQUENCE))) {
  96                 ASN1err(ASN1_F_ASN1_SEQ_PACK,ASN1_R_ENCODE_ERROR);
  97                 return NULL;
  98         }
  99         if (!(safe = Malloc (safelen))) {
 100                 ASN1err(ASN1_F_ASN1_SEQ_PACK,ERR_R_MALLOC_FAILURE);
 101                 return NULL;
 102         }
 103         p = safe;
 104         i2d_ASN1_SET(safes, &p, i2d, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL,
 105                                                                  IS_SEQUENCE);
 106         if (len) *len = safelen;
 107         if (buf) *buf = safe;
 108         return safe;
 109 }
 110
 111 /* Extract an ASN1 object from an ASN1_STRING */
 112
 113 char *ASN1_unpack_string (oct, d2i)
 114 ASN1_STRING *oct;
 115 char *(*d2i)();
 116 {
 117         unsigned char *p, *ret;
 118         p = oct->data;
 119         if(!(ret = d2i(NULL, &p, oct->length)))
 120                 ASN1err(ASN1_F_ASN1_UNPACK_STRING,ASN1_R_DECODE_ERROR);
 121         return ret;
 122 }
 123
 124 /* Pack an ASN1 object into an ASN1_STRING */
 125
 126 ASN1_STRING *ASN1_pack_string (obj, i2d, oct)
 127 char *obj;
 128 int (*i2d)();
 129 ASN1_STRING **oct;
 130 {
 131         unsigned char *p;
 132         ASN1_STRING *octmp;
 133
 134         if (!oct || !*oct) {
 135                 if (!(octmp = ASN1_STRING_new ())) {
 136                         ASN1err(ASN1_F_ASN1_PACK_STRING,ERR_R_MALLOC_FAILURE);
 137                         return NULL;
 138                 }
 139                 if (oct) *oct = octmp;
 140         } else octmp = *oct;
 141
 142         if (!(octmp->length = i2d(obj, NULL))) {
 143                 ASN1err(ASN1_F_ASN1_PACK_STRING,ASN1_R_ENCODE_ERROR);
 144                 return NULL;
 145         }
 146         if (!(p = Malloc (octmp->length))) {
 147                 ASN1err(ASN1_F_ASN1_PACK_STRING,ERR_R_MALLOC_FAILURE);
 148                 return NULL;
 149         }
 150         octmp->data = p;
 151         i2d (obj, &p);
 152         return octmp;
 153 }
 154